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(No Model.) v 2 Sheefis-Sheeti.

O. H. OROOKETT & G. G. ALLEN.

LOOKING AND UNLOGKING MECHANISM FOR ELECTRIC LOCKS.

No. 323,918. Patented Aug. 11, 1885.

Ug us (No Model.)

2 Sheets-Sheet 2. C. H. GROGKETT & 0. 0. ALLEN. LOOKING AND UNLOGKING MECHANISM FOR ELECTRIC LOOKS. No. 323,918.

Patented Aug; 11, 1885.

WIT NEE 5E5 |N\/ENTUFR'5 4 3 wwwvzam) N. PETERS, Phulo-Lithognpher, Wnhlnglun, D.C

' NITED TATES 'arhnr rrrc CHARLES H. OROOKETT AND OHANOELLOR C. ALLEN, OF BOSTON, MASS.

LOCKING AND UNLOCKI NG MECHANISM FOR ELECTRIC LOCKS.

SPECIFICATION forming part of Letters Patent No. 323,918, dated August 11, 1885.

Application filed June 1, 1895.

To aZZ whom it may concern:

Be it known that we, CHARLES H. GRooK- ETT and CHANOELLOR O. ALLEN, citizens of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented an Improved Locking and Unlocking Mechanism for Electric Locks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of a mortise latch-lock constructed in accordance with our invention, the covering-plate being removed.

Figs. 2 and 3 are similar elevations of the same with some of the parts in different positions. Fig. 4 is a section on the line 50.20 of Fig. 1; Figs. 5 and 6, details.

Our invention relates to certain improvements in electric locks of that description in which the outside knob can only be used to retract the 1atch-bolt and open the door of the building at the will of a person on one of the fioorsof the same, with whom communication is had by means of a speaking-tube or otherwise; and our invention consists in an electric lock in which the spindle with which the outside knob is connected is normally free to rotate without moving the operative parts of the lock with which the said spindle is adapted to be connected at the desired times by means of mechanism brought into action by an electromagn'et energized by the closure of an electric circuit by the person having control of the look from the inside of the building, by which construction the possibility of undue strain being put upon the look through the spindle in turning or attempting to turn the same, is avoided, and the mechanism operated by the electro-magnet rendered certain in its action and free to operate under all conditions, as hereinafter particularly set forth.

In the said drawings, A represents the casing of the look, within which, in suitable guides, is fitted the bolt B, surrounded as usual by a coiled spring, I), by which it is projected to cause it to act as alatch. At the inner end of the bolt B is an arm, 0, against which bears the lower end of a long vertical lever, O, pivoted at its upper end at d, and adapted to be moved against the stress of a spring, 6, by a (No model.)

tumbler, D, which bears thereon, whereby, as the tumbler is rotated in either direction by the knob-spindle, the bolt is retracted in a well-known manner. The spindle G of this look is of that description known as a swivelspindle, being composed of two portions connected by a swivel-joint, as seen in Fig. 4., whereby they are adapted to be rotated independently of each other. That portion f of the spindle to which the inside knob, H, Fig. 4, is attached passes through the tumbler D, and is at all times connected therewith ready to retract the bolt when rotated, while the other portion, 9, of the spindle to which the outside knob, I, is secured, carries a notched or toothed wheel, K, which, when the parts are in their normal position, as seen in Fig. 1,

is free to be rotated with the portion 9 of the.

spindle without moving or affecting any other portion of the lock, thus rendering it impossible to retract the bolt by turning the outside knob when the parts are in this position. This wheel K is, however, connected to the tumbler, when desired, by the person having control of the lock in the following manner:

h is a curved dog or catch lever which is pivoted to the tumbler D at i, and is provided at its lower end with a catch or projection, 10, which is adapted to enter one of the spaces or notches between the teeth of the wheel K, when the dog is moved by a light spiral spring, Z, connected therewith and with the tumbler D, the tendency of the spring Z being to draw the lower arm of the dog inward toward the wheel K. The upper end or arm of the dog h is, however, normally held down against the resistance of the spring Z to keep the projection 10 out of contact with the wheel K, by means of a bell-crank lever, L, pivoted at m to a horizontal slide or carrier, N, one end of which moves in a guide, the opposite end being pivoted at q to the lever C. One arm of the lever L bears upon and holds down the upper arm of the dog It against the resistance of the spring Z, while the upper or short arm of this lever is engaged and held by a detent or catch, '2', at the end of the pivoted armature s of an electromagnet, Q, the conducting-wirest a, connected to the poles of which, pass through the door to which the lock is applied, and are suitably connected wit-h wires leading to the different floors of the building. \Vhen the person having control of the lock closes the circuit through the magnet Q, by means of a suitable button or key, the armature s is attracted or drawn up to the poles of the magnet, which thus causes the catch r to release the lever L, when the dog it upon which it bears is instantly moved by its spring Z, and the projection 10 caused to enter one of the notches of the wheel K or bear upon this wheel ready to enter one of its notches on its being rotated by the portion 9 of the spindle, and as soon as the projection 1.0 enters one of these notches the tumbler D becomes temporarily connected to the wheel K, so that the rotation of the latter by the spindle of the outside k nob will cause the bolt B to be retracted as desired to allow of the door being opened by the person on the outside. The movement of the lever G in retracting the bolt B moves the slide N in the direction of the arrow, Fig. 3,which brings the upper arm of the lever L again beneath the detent r of the armature s,

which thus catches it and causes it to be automatically reset for the next operation, the movement of the lever L when released being limited by a suitable stop, which thus insures the upper arm of this lever being carried under the detent by the movement of the slide N. \Vhen the outside knob is released, the lever C is retracted by its spring 6, causing the slide N to move in a direction contrary to the arrow, Fig. 3,which brings the upper end of the lever L into contact with the detent 1-, whereby, as the slide N still continues to move in the same direction, the lower arm of the lever is depressed by reason of the upper arm being held fast by the detentr, causing the said lower arm to bear down forcibly upon the up per arm of the dog h and withdraw the projection 10 out of contact with the notched wheel K, thus automatically disengaging the latter from the tumbler l), and leaving the wheel K again free to be rotated by its spindle without operating the lock, the bolt of which is thus instantly thrown out of connection with the outside knob after each operation of the latter,which at the same time resets the lever L, ready to be again released by the closing of the electric circuit through the magnet Q, as before described. It will be seen that the lever L is reset by the movement of the lever G and slide N connected therewith, and that the bolt 13 can be moved independently of and does not control the resetting of the lever L.

To the pivoted end of the armature s is secured a light curved flat metal spring, 10, having an offset, 15, Fig. 5, against which the lever G is brought into contact as it is moved by the tumbler D to retract the bolt, whereby a downward pressure is exerted upon the armature s to insure its being drawn down away from the magnet in case it should be retained in contact therewith by residual magnetism which might exist after the circuit through the magnet has been broken.

\Vhen the parts are in the position seen in Figs. 1 and 2, it will be seen that there is no tension on the spring 10, as it is not in contact with the lever O, and consequently the spring exerts no pressure upon the armature .9 while it is being drawn up to the poles of the magnet, which is an important consideration, as no additional force is required on account of the employment of the spring, which is only brought into action by the movement of the lever O to insure the armature 8 being withdrawn to catch the bell-crank lever L at the proper time.

What we claim as our invention, and desire to secure by Letters Patent, is

1. The combination, in a doorlook having a swivel knob-spindle composed of two independently-rotating parts, of a tumbler connected with one portion of the spindle and adapted to actuate the bolt-retracting lever, a notched or toothed wheel connected with the other portion of said spindle and normally free to rotate without operating the lock, and a dog or catch lever controlled by an electromagnet and adapted to be thrown into and out of engagement with the notched or toothed wheel, whereby the latter is connected with and disconnected from the tumbler at the desired times, substantially as and for the purpose set forth.

2. The combination, with the operative parts of a door-lock having a swivel knobspindle, of a notched or toothed wheel connected with that portion of the spindle to which one knob is attached, and normally free to rotate without operating the look, a dog or catch lever adapted to engage said notched wheel and pivoted to the bolt operating tumbler connected with the other portion of of a notched or toothed wheel connected with r V one portion of the spindle to which one knob is attached and normally free to rotate with out operating the lock, a tumbler connected to the other portion of the spindle to which the other knob is attached, a lever operated r by said tumbler against the resistance of a spring to retract the bolt,a dog pivoted to the tumbler and adapted to engage with the notched wheel, a device connnected with the lever operated by said tumbler for holding the 1 dog out of engagement with the notched wheel, and an electromagnet for releasing the said device, the parts being so arranged that when the magnet is energized the dog will be released and brought into engagement with the notched wheel to temporarily connect the same with the tumbler, whereby the bolt may be retracted by turning the outside knob, substantially as set forth.

t. In an electric doorlock, the combination of a sliding-bolt, a swivel knob-spindle composed of two independently-rotating parts, a tumbler connected with one portion of the spindle,a notched or toothed wheel connected with the other portion of the spindle, a lever actuated by said tumbler for retracting the bolt, a dog pivoted to the tumbler and adapted to engage with the notched wheel, a slide or carrier connected with the tumbler-lever, a bell-crank lever pivoted to said slide,one arm of the bell-crank lever being engaged by adetent or catch controlled by an electro-magnet and armature,the other arm bearing upon the dog and holding the same out of engagement with the notched wheel, the arrangement be-- ing such that when the bell-crank lever is released by the closing of the circuit through the magnet the dog will be released and brought into engagement with the notched wheel to connect the latter with the tumbler, and the bell-crank lever automatically reset by the movement of the tumbler-lever, substantially as described.

5. In an electric lock, the combination of a sliding bolt, a swivel knob spindle, a tumbler connected with one portion of the spindle, a pivoted lever between the tumbler and bolt provided with a. retracting-spring, a notched or toothed wheel connected with the other portion of the spindle, a dog pivoted to the tumbler and adapted to engage with the notched-wheel, and having a spring for actuating the same when released, a slide or carrier pivoted to the tumblerlever, and a bell-crank lever pivoted to the slide and controlled by an electro-magnet and armature, and adapted to bear upon the dog and normally hold it out of engagement with the notched wheel, the parts being so arranged that after the bell-crank lever has been released by the armature of the magnet the movement of the tumbler-lever will automatically reset the bell-crank lever and cause the latter to positively disengage the dog from the notched. wheel and hold it out of contact therewith until again released by the closure of the cirouit through the electro-magnet, substantially as set forth.

6. In an electric lock, the combination of the sliding bolt B, the lever O, pivoted at d and provided with a spring, 6, the tumbler D, swivel-spindle G, notched or toothed wheel K, dog h, pivoted to said tumbler and adapted to be brought into engagement with the notched 5 5 wheel K by the spring Z, the slide or carrier N, pivoted to the lever O, the bell-crank lever L,,pivoted to said slide and bearing on the dog 71/, the armature 8, having a catch or detent, 'r, for holding the upper arm of the bell-crank lever L, and the electro-magnet Q, with its conducting wires,all constructed and arranged to operate substantially in the manner and for the purpose described.

7. The combination, with the electromagnet and its armature provided with a detent or catch, of a spring exerting no pressure upon said armature when the latter is being attracted to the magnet, and adapted by the movement of a lever or arm acting thereon to exert a pressure on the armature to withdraw it from the magnet after the circuit is broken, substantially as and for the purpose described.

8. The combination, with the lever C, the magnet Q, and the armature s, of the spring w, secured to the armature at or near the pivotedend and lying out of contact with the lever C and without tension during the movement of the armature toward the magnet, and adapted to be brought into action to exerta pressure upon the armature to withdraw it from the magnet by the movement of the lever, substantially as and for the purpose set forth.

lVitness our hands this 29th day of May, A. D. 1885.

CHARLES H. GROOKETT. OHANOELLOR O. ALLEN. In presence of- P. E. TESOHEMAOHER,

W. J. CAMBRIDGE. 

